EXPEDITION ANTARCTIQUE BELGE 



Habitat. — South Indian Océan. Lat. 53° 55' S.- Long. io8° 35' E. ; jg5o fathoms 

 (3i6o mètres). 



Exp. Antarct. Belge. 



N os 608, 618, 620, 621, 991, Tangles VIII. Lat. 7o°oo' S.- Long. 8o°48' W.; 5oo ? mètres ; 

 +0.9 C. 



Bugula reticulata Busk. 



Bugula reticulata Busk, Zool. Chall. Exp.. vol. X. pt. XXX, p. 40, pi. VIII, ûg. 3. 



There are only two or three small fragments, but in thèse, latéral radicles are given 

 off from the side of the zoœcium, just as in the Challenger spécimens, but the avicularian 

 pedicel is longer than those figured by Busk. There are two distal rosette plates, and 

 21 to 22 tentacles. 



Habitat. — Crozet Islands 1600 fathoms (25go mètres) ; off the Argentine, 600 fathoms 

 (960 mètres) ; off Chili, 2160 fathoms (35oo mètres) ; Patagonia, i325 fathoms (2i5o mètres). 



Exp. Antarct. Belge. 



N° 568, Tangles VII. Lat. 70 23' S.- Long. 82047' N.; 480 met.; +0.8 C. 



N° 621, Tangles VIII. Lat. 70° 00' S.- Long. 8o° 48' V. ; 5oo?met.; +0.9 C. 



Bugula reticulata Busk, V ar. spinosa nov. 



(PL I, figs. 3a-d) 

 Type; Bugula reticulata Busk, Zool. Chall. Exp., vol. X. pt. XXX. p. 40, pi. VIII, fig. 3. 



The Antarctic form most nearly resembles the B. reticulata, var. unicornis Busk of the 

 Challenger ; and to show the connection it seems simplest to call it var. spinosa. 



The primary zoœcium of the spécimen from 610 (fig. 3a, b\ has an open area in front, 

 about half the length of the zoœcium, and both this and the following zoœcium hâve six 

 spines, but then after several normal zoœcia, with three spines, the tenth zoœcia again has 

 six. In another spécimen, from the same localitv, the first seven or eight zoœcia, after the 

 primary, hâve four spines, and then follow normal zoœcia with three. The zoœcia as a 

 iule hâve two spines on the outer border and one on the inner. The zoœcia are shorter 

 than those of the Challenger var. unicornis B., while, from the locality already referred to, 

 there is a small pièce (fig. 3d) with rather longer zoœcia, and in this spécimen the small 

 pediculated avicularium, just below the area is quite similar to those shown in (figs. 3a, b). 

 Thèse variations indicate, that there is no sufficient reason for spécifie séparation. The 

 radicles arise from a bifurcation, but in the younger zoœcia of the spécimen first referred 

 to, there are a few radicles from near the proximal end, and although elsewhere no radicles 

 are found growing from the side of the zoœcia, yet there are to many zoœcia small internai 

 radicle chambers. In previous papers allusion has been made to the fact, that in many 

 species of Bryozoa thèse chambers are often found when there are no radicles. 



In a few zoœcia without polypides there are a pair of small globular bodies, arising 

 from the distal end of the zoœcium ; no doubt thèse are homologous with the vermiform 

 bodies in B. bicornis. In a later stage they are further removed from the distal end and 



